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Multiscale analysis of head-on quenching premixed turbulent flames

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cam.issuedOnline2018-10-08
dc.contributor.authorAhmed, U
dc.contributor.authorDoan, NAK
dc.contributor.authorLai, J
dc.contributor.authorKlein, M
dc.contributor.authorChakraborty, N
dc.contributor.authorSwaminathan, N
dc.contributor.orcidDoan, NAK [0000-0002-9890-3173]
dc.contributor.orcidLai, J [0000-0001-9409-5669]
dc.contributor.orcidSwaminathan, N [0000-0003-3338-0698]
dc.date.accessioned2018-11-23T00:30:19Z
dc.date.available2018-11-23T00:30:19Z
dc.date.issued2018
dc.description.abstract<jats:p>Multiscale analysis of wall-bounded turbulent premixed flames is performed using three-dimensional direct numerical simulation data of flame-wall interaction (FWI). The chosen configuration represents head-on quenching of a turbulent statistically planar stoichiometric methane-air flame by an isothermal inert wall. Different turbulence intensities and chemical mechanisms have been analyzed. A bandpass filtering technique is utilised to analyze the influence of turbulent eddies of varying size and the statistics of vorticity and strain rate fields associated with them. It is found that the presence of the flame does not alter the mechanism of vortex stretching in turbulent flows when the flame is away from the wall, but in the case of FWI, the mechanism of vortex stretching is altered due to a reduction in the contribution from non-local strain, and the small scales of turbulence start to contribute to the flame straining process. The results indicate that small scale eddies do not contribute to the tangential strain rate when the flames are away from the walls, whereas the contribution from the small scales to the tangential strain rate increases when the flame is in the vicinity of the wall. It is also found that the choice of chemical mechanism does not influence the underlying fluid mechanical processes involved in FWI.</jats:p>
dc.identifier.doi10.17863/CAM.33081
dc.identifier.eissn1089-7666
dc.identifier.issn1070-6631
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285737
dc.language.isoeng
dc.publisherAIP Publishing
dc.publisher.urlhttp://dx.doi.org/10.1063/1.5047061
dc.subject4012 Fluid Mechanics and Thermal Engineering
dc.subject40 Engineering
dc.subject4017 Mechanical Engineering
dc.subject4002 Automotive Engineering
dc.titleMultiscale analysis of head-on quenching premixed turbulent flames
dc.typeArticle
dcterms.dateAccepted2018-09-16
prism.issueIdentifier10
prism.publicationDate2018
prism.publicationNamePhysics of Fluids
prism.volume30
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P022286/1)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/K025791/1)
rioxxterms.licenseref.startdate2018-10-01
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1063/1.5047061

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